Question

1. substitute these values into each expression; x = 4, y = 7, z = 2

a. x + y + z
b. 2x - y + 3z
c. 4y + 2z - x
d. x² + 7y + 5x

Explanation:

Step1: Substitute values for a.

$4 + 7 + 2$

Step2: Calculate a's result.

$4+7+2=13$

Step3: Substitute values for b.

$2(4) - 7 + 3(2)$

Step4: Calculate b's result.

$8-7+6=7$

Step5: Substitute values for c.

$4(7) + 2(2) - 4$

Step6: Calculate c's result.

$28+4-4=28$

Step7: Substitute values for d.

$4^2 + 7(7) + 5(4)$

Step8: Calculate d's result.

$16+49+20=85$

Answer:

a. 13
b. 7
c. 28
d. 85