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Concept: Substitution
Find the value of the following expressions if x = 7 and y = -3
1. 9x - 8y - 2 (substitute the value of x and y)
= 9(7) - 8(-3) - 2
= 63 + 24 - 2 (-8 * - 3 both is negative so the product is positive)
= 85
2. x + 4y / x - y (substitute the value of x and y)
= (7) + 4(-3) / (7) - (-3)
= 7 - 12 / 7 + 3 (it becomes +3 because -1 * -3 = + 3)
= -5 / 10
= -0.5 or - 1/2
3. 7x(x + y + 3) (substitute the value of x and y)
= 7(7)(7 - 3 + 3)
= 49(7)
= 343
4. x² + 6 (substitute the value of x and y)
= (7)² + 6
= 49 + 6
= 55
5. 4x² - 2y + 3 (substitute the value of x and y)
= 4(7)² - 2(-3) + 3
= 4(49) + 6 + 3
= 196 + 9
= 205
6. 3y(y + 9) / 10 (substitute the value of x and y)
= 3(-3)(-3 + 9) / 10
= -9(6) / 10
= -54 / 10
= -5.4 or -5 2/5
7. 6xy - 4 / 2 (substitute the value of x and y)
= 6(7)(-3) - 4 / 2
= 6(-21) - 4 /2
= -126 - 4 /2
= -130 / 2
= -65
8. 3xy - 4x²y (substitute the value of x and y)
= 3(7)(-3) - 4(7)²(-3)
= -63 - 4(49)(-3)
= -63 + 588
= 525
9. 5y + 2 (substitute the value of x and y)
= 5(-3) + 2
= -15 + 2
= -13
10. 2x - y³ + 8 (substitute the value of x and y)
= 2(7) - (-3)³ + 8
= 14 - (-27) + 8
= 14 + 27 + 8
= 49
Step-by-step explanation:
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Answer:
Step-by-step explanation: